The December 1975, issue of "Illinois Libraries" provides a progress and status report on Illinois' network of 18 public library systems, 17 of which are cooperative library systems consisting of from 17 to 70 public libraries. Each system's annual report is included. Statistics for the entire state are given in five tables covering general information, system resources, operating receipts, operating expenditures, and equalization aid figures. The report also contains the text of the 1965 Illinois Library Systems Act together with its later amendments, and a listing of the board of directors and staff for each system. (Author/NR)